Dyestuffs of the anthraquinone series



Patented Jan. 10, .1950

- 2,494,240 7 nrns'rprrs or THE ANTHRAQUINONE scams Ernst Gutzwiller, Basel, Switzerland, assignor to Sandoz Ltd., Basel, Switzerland, a Swiss firm No Drawing. Application March 18, 1947, Serial In Switzerland September 30,

' Section 1, Public Law 690, August 8, 1946 Patent expires September 30, 1963 4 Claims. 1 The present invention relates to new green dyestuffs f the anthraquinone series and to a process for their manufacture and is in part a continuation of my copending Patent No. 2,448,094 of August 8, 1948.

I have found that new Very fast green dye-.

stuffs of the anthraquinone series can be prepared by first condensing anthraquinone compounds containing in the positions :1 and 4 replaceable atoms or groups and further containing in the positions 6 and 7 halogen atoms, with aromatic bicyclic amines and by subsequently sulfonating the resultant condensation products.

For the manufacture of the intermediate products use may be made of compounds, such as 6.7-dichloroquinizarine, IA-diamino-Gfl-dichloh anthraquinone, 1.4-aminohydroxy-6.7-dichloranthraquinone, 1.4-aminomethoxy 6.7-dichloranthraquinone, 6.7-dibromoquinizarine, 6.7-chlorobromoquinizarine, 6.7 -chlorobrom-1.4-hydroxyaminoanthraquinone, 6.7-dibrom-lA-diaminoan thraquinone and the like. The starting products can be used for the condensation either as-such or in form of their leuco compounds, whereby preferably a mixture consisting of the leuco compound and of the unreduced compound is used for the condensation. The leuco-compound can be prepared during thecondensation by addingto the reaction mass a reducing agent like hydrosulfide, zinc powder and the like.

As further starting products I can use 1.4- methoxy-nitro-G.7-dihalogenanthraquinones, 1.4- hydroxynitro 6.7 dihalogenanthraquinones, 1.4.6.7-tetrahalogenanthraquinones and l-methoxy-4.6.7-trihalogenanthraquinones. 'In cases where the positions 1 and/or 4 are occupied by halogen atoms, the condensation is carried out preferably in the presence of a catalyst, like-copper powder or a copper compound and of an acid binding agent, like sodium or potassium acetate, sodium-, potassiumor calcium carbonate and the like.

The aromatic bicyclic amines I use for the condensation are for instance 1- and 2-naphthylamine, 1- and 2-amino-5.6.7.8 tetrahydronaphthalene, aminodiphenyls, like l-amino-diphenyl, 4.4-aminodiphenylcarboxylic acid ethyl ester,

aminodiphenyl ethers, like 4- orB-aminodiphen'yl' ether, aminodiphenyl methanes, aminodiphenyl sulfides and similar compounds. The condensation itself is carried out preferably in the presence of solvents, like ethanol, propanol, butanol, amyl alcohol, benzyl alcohol, cyclohexanol, methyl-cyclohexanol, pyridine and the like. of course, the aromatic bicyclic amines, when used in an excess can also act as solvent. The condensation is preferably carried out at temperatures between 70 and 220 C. according to the nature of the starting products used. If'leu co compounds are used as such or in admix re with the unreduced" anthraquinone compound, the reaction product obtained consists of the leuco base or contains a more or less great quantity of leuco base. These leuco compounds can be oxidised in the reaction mass by means of a current of air, if necessary in the presence of some piperidine and copper acetate, pyridine, triethanolamine or any other basic acting substance. The dyestuff base is then isolated, if necessary after addition of ethanol, by filtration and washing with ethanol and water. It is also possible to isolate first the leuco base or the mixture of the base with the leuco base and to oxidise the same in a high-boiling solvent, such as pyridine, aniline, dimethylaniline, nitrobenzone and the like, at an elevated temperature with a current of air and to allow the base to crystallize out on cooling down or to precipitate it by means of ethanol and some sodium hydroxide solution. Generally I prefer to work in such a manner that the condensation product does not contain any appreciable quantity of the leuco compound and in such a manner that, after the condensation, the dyestufi base can be separated by usual methods.

A further feature of the present invention is the transformation of the condensation products which are water-insoluble into valuable watersoluble green dyestuffs by treating the dyestuff bases with s-ulfonating agents, like concentrated sulfuric acid, sulfuric acid monohydrate, fuming sulfuric acid or chlorosulfonic acid. The dyestufis thus obtained are isolated in the usual manner and they :dye wool, silk, nylon and other similar textiles in very fast green shades.

The following examples, without being limitative, illustrate the present invention, the parts being by weight:

Example 1 20 parts of leuco-6.7-dichlorquinizarine, 30 parts of 6.7-dichlorquinizarine, 18 parts of boric acid and 300 parts of 1-amino-5.6.7.8-tetrahydr0- naphthalene are stirred at 100-150 C. until the condensation is finished. If necessary the leuco base still present is oxidised by means of a current of air, preferably in the presence of some piperidine and copper acetate. The charge is cooled down to C., 250 parts of ethanol being then added thereto and the precipitate filtered still warm, washed with hot ethanol and hot water. The base which is obtained in form of dark crystals and which can be recrystallized from organic solvents, like aniline, nitrobenzene or dimethylaniline, is soluble in organic solvents with a green coloration and is the 1.4-di- (5'.6'.7.8' tetrahydro 1 naphthylamino) 6.7-dichloranthraquinone.

10. parts of the condensation product thus obtained are dissolved in 5-8 times its weight of oleum containing 5-10% S03 and stirred at 15-45 C. until a. test taken out shows-that it is completely water-soluble; The dyestufi thus *produced is isolated in the usual manner; it dyes wool in yellowish-green shades ofvery good fastness properties.

Instead of 6.7-dichlorquinizarine and leuco- 6.7-dichlorquinizarine respectively one can use 6.7 dichlor 1.4 hydroxyaminoanthraquinone; 6.7-dichlor-1.4-diaminoanthraquinone or their leuco compounds respectively-whereby the identical dyestufi? will be Obtained.

Instead of the starting products usedinthis example 6.7-dibromoquinizarine or itsleucocompound, or 6.7-chlorobromoquinizarine or its leuoO compound can be used, whereby the corresponding halogenated derivatives will be obtained.

Instead of using a great" excess of -amino- 5.6.7.B-tetrahydronaphthalene one can use a much smaller quantity and-work inthe presence of a diluting agent, such as for example methyl cyclohexanol, amyl alcohol; butyl alcohol and the like.

Example 2 7 parts of leuco-fi.7-dichloroquinizarine;. 10

parts of '6.7-dichloroquinizarine, 7 parts of acetic acid 85%, 2 parts of boricacid. and 90partsof- 2 amino 5.6.7.8 tetrahydronaphthalene are stirred at 100-405 C. until no further reaction can be observed. After diluting'with GO parts of ethanol, the charge is filtered at Gil-65 (1.. washedfirst with hot ethanoland. thenwithhot water. The beautifully crystallized reaction; product, which is the 1.4-di-(!.6'.7.8-tetrahydro2- naphthylamino) 6.7 dichloranthraquinone issoluble in organic solvents witha green coloration.

partsof the reaction product are-dissolved in 40 parts of sulfuric acid monohydrate then 30' parts of oleum containing 28% S03 are added. thereto and the chargestirredat 40-45? C. until a test shows that the wholeiswater-soluble. After cooling down-the charge-is poureddnto 250 parts of a 5% sodium chloride solution. filtered, again suspended in 200. parts of.a'5% sodium chloride solution, neutralized, filtered and dried. The dyestuff thus obtained. dyes woolzin very fast brilliant green shades.

Example 3 30 parts of 1.4.6:7-tetrachloranthraquinone; parts of potassium acetate. 180 parts of 2amino- 5.6.7.8-tetrahydronaphthalene and 3par-tsof copper acetate are stirred at ISO-220 C. until the condensation is finished: The charge is cooled down to 90 C... then. 150 parts of. ethanol are added thereto and the whole is filtered, washed.

Example 4 10 parts of leuco-6.7edichlor.oquinizarine, 15. parts of 6.7-dichloroquinizarine, 5 parts oiv boric. acid, 75 parts of 4-aminodiphenyl and 150 parts of methylcyclohexanol are. stirred at 100460 C. until the condensation is complete. After cool ing down to 90 C. the charge is diluted with150 parts of ethanol, filtered still hot and successive- 1y washed with hot ethanol and hot water. Thev v to 7 times its weight of sulfuric acid Jar-100% and stirred'at id- C; ifnecessary after addition of a small quantity'of" fuming sulfuric acid containing 28% S03, until atest is completely soluble in water. The dyestuff is isolated in the usual manner and dyes wool in very fast green shades.

Example 5 9 parts of leuco-6.7-dichloroquinizarine, 13

,. partsof 6.7-dichloroquinizarine, 5 parts of boric acid, parts of 4-aminodiphenylether, 10 parts ofacetic acid'90%-and-l60' partsofamvl alcohol are stirred together at 100-130 C. until the condensation: is finished. After diluting with 150 parts-ofethanol the charge is filtered at 0., washed successively with hot ethanol and hot water and dried: If necessary, the dyestufi base can be purifi'edby crystallisation. For this purpose lllparts of the base are dissolved for instance in lodparts of aniline, heated at 160 -170 C. for a'short time,- allowed-tocool downto C. and treated at the latter: temperature with 50 parts of ethanol and 4 parts of caustic soda lye 30%.. After filtration at 70 C; the-precipitate is washedsuccessively'withhot ethanol and hot water. The

dyestuffi base thus. obtained iszlA-di- (4' -.phenoxyphenylamino)-fifl dichloranthraquinone and issoluble in organic solvents with a green coloration.-

10' parts of'this dyestuff'base are dissolved in 4 to? times its weight of sulfuric acid93-100'% and The dyestufl isolatediin the usual mannr and dyes stirred: until. a. test became water-soluble.

Example 6' 7" parts: of leuco-fi.7-dichloroquinizarine, 10

parts of 6.7-dich1oroquinizarine;.3. parts of boric acid, 6: parts of. acetic; acid, 80%, 60 parts of 2- naphthylamine and. 80 parts of amyl alcohol are stirred together at 160 130 C- untilthe condensationis finished. At atemperature of 80 C. 80-

parts ofethanol;are-addedand'thecharge is illtered at about 70 G... washed with hot ethanol and hot water. heated. with 500 parts of hydrochloric. acid 5% at -95. 0., filtered stillhot, washed until neutral and dried. Thebasethusohtained can, if necessary, be recrystallized from high boiling organic solvents. The lAr-dis-(2.'-naphthy1amino).-6.7-dir chloranthraquinone thus obtained: is soluble in. organic solvents with agreen coloration.

10. parts of this dyestuif base are dissolved in 4 to 8 times; its weight of sulfuric acid 95-100% and stirred. until a testis completely soluble in water. The dyestufi isolated-in the usual manner dyes wool in fast green shades.

Example 7 7 parts, of leucmfifl dichloroquinizarine ,.10; parts or" 6.7-dichloroquinizarine, 3 parts of horic acid, 30 parts of. bnaphthylamine, 70- parts of; base thus obtained can be recrystallized. from. a. amyl alcohol and 4. parts-of acetic acid 80% are;

The base thus obtained is then which dyes animal and synthetic nitrogen-containing fibres into fast green shades.

2. The anthraquinone dyestufi of the formula O NH 0!:[1 H H; Cl

6 which dyes animal and synthetic nitrogen-containing fibres into fast green shades.

3. An anthraquinone dyestufi of the formula t NH-R wherein X stands for a member selected from the group consisting of chlorine and bromine, and wherein R. is a univalent radical selected from the group consisting of 1-(ar-sulfo,5,6,7,8-terahydro) naphthyl, 2-(ar-sulfo,5,6,7,8-tetrahydro) -naphthyl, 1 (4 sulfophenoxy) -phenyl, 1 (4 sulfophenyl) -phenyl and 1-(4-cyclohexyl) -sulfophenyl, the R radicals being identical.

4. The anthraquinone dyestufl of the formula i m C S 03H 01 S OaH which dyes animal and synthetic nitrogen-containing fibres into fast green shades.

ERNST GUTZWILLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,042,757 Zahn et a1 June 2, 1936 2,315,788 Gutzwiller Apr. 6, 1943 2,377,145 Gutzwiller May 29, 1945 

3. AN ANTHRAQUINONE DYESTUFF OF THE FORMULA 